Yes you can delete it. Google "windows xp os "or go to most computer stores and you can pick up a copy of the old os. You should be able to get it with SP3 for around $80 plus shipping. Cheaper elsewhere but that's average I see from a quick google search.
Know what your wife means, I had Win XP, loved it, computer pooped out, bought another, only Vista available, hated it with a passion, didn't remove it and replace with XP....After a couple of years I can now live with it but XP was the best !!!!
wait till seven is released, you're gonna like it...microcrap finally did it right. am a beta tester and now the rc is out and it's very nice...vista reminds me of when microcrap rushed out melinium (spelling) "me" to the public... i think they learned their lesson with that mess...i think the best have been, win98se(second edition), xp pro(with sp3) and soon, seven...tx
im not gonna lie, i miss XP... BUT! once you learn vista, its pretty awesome. you just have to number one, take the time to do so, and number to WANT to do it. it got real easy after i sucked it up and realized i didnt have much of a choice.
You want BAD? Try running Vista 64! I bought a Dell Studio in a crunch because my old laptop died in the middle of a project. I didn't realize it had Vista x64 on it. This takes compatibility issues to a new level! After a few months of struggling, tweaking, and hacking, it's tolerable.
Yes, you can wipe out Vista and install XP. Do a little research first, however. Some of your hardware (particularly Dell and HP) MIGHT be licensed to only function with Vista. You'll not be able to find XP drivers in some cases.
Find and download your drivers first. If this is a name brand, check with the manufacturer. They may have an XP driver package for download or on CD.